NSF 23-501: Mathematical and Physical Sciences Ascending Postdoctoral Research Fellowships
Closed
This grant is closed. A newer notice from the same program is open now: Major Research Instrumentation Program: (MRI) (NSF 27-500). Status: Closes January 29, 2027 (83 days left). It is in our archive of U.S. National Science Foundation notices from 2025.
U.S. National Science Foundation offered grants of up to $300,000 (at least $100,000) to the applicants described in the notice. It expected to make about 50 awards worth $10.0 million in total. It is no longer open on Grants.gov.
From the official notice on Grants.gov, last changed June 7, 2025. Checked November 7, 2026.
- Award ceiling$300,000
- Award floor$100,000
- Total funding$10.0 million
- Expected awards50
- Cost sharingNot required
- Funding typeGrant
Key dates
| Posted | June 6, 2025 |
|---|---|
| Archived by Grants.gov | June 7, 2025 |
Who can apply
This opportunity was open to the applicants described in the notice.
- Others (see text field entitled "Additional Information on Eligibility" for clarification)
*Who May Submit Proposals: Proposals may only be submitted by the following: - MPS-Ascend Postdoctoral Research Fellowships are awards to individuals; proposals are submitted directly by the fellowship candidate to NSF. Each candidate must identify one or more scientific mentor(s) and host institution(s) in the proposal. Activities supported by the MPS-Ascend Fellowship program may be conducted at any appropriate U.S. host institution as defined in Section II, "Program Description." *Who May Serve as PI: Proposers must self-certify that they are eligible to receive the Fellowship. An individual (also referred to as a Fellow or proposer) is eligible to submit a proposal to the MPS-Ascend Postdoctoral Research Fellowship program if all the following criteria are met: <ul type="disc"> <li>Must be a U.S. citizen (or national) or legally admitted permanent resident of the United States (i.e., have a "green card") at the time the proposal is submitted;</li> <li>Presents research, professional development, and broadening participation plans that fall within the purview of one of the Divisions (Astronomical Sciences, Chemistry, Materials Research, Mathematical Sciences, or Physics) within the Directorate for Mathematical and Physical Sciences;</li> <li>May not have previously been a principal investigator or co-principal investigator of an NSF award (other than a graduate research fellowship or an award in support of a conference or workshop);</li> <li>May not submit a research plan duplicated in another NSF proposal currently under consideration;</li> <li>Must have completed all the requirements for a doctoral degree before the postdoctoral appointment start date;</li> <li><span>It is anticipated that the research will be conducted at an institution other than the Fellowship candidate's doctoral-granting or current postdoctoral fellowship institution. However, if the Fellowship candidate chooses to remain at their current institution, the Project Description should include a strong justification of how this choice benefits their research and career development.</span></li> </ul> <span>Proposals that fail to meet the above eligibility requirements may be returned without review.</span> Proposers uncertain about the eligibility requirements are strongly encouraged to contact a cognizant NSF program officer listed in this solicitation before preparing the proposal. Fellowships must begin no later than September 1, following the submission deadline. <span>By signing and submitting the proposal, the fellowship candidate is certifying that they meet the eligibility criteria specified in this program solicitation. Willful provision of false information in this request and its supporting documents or in reports required under an ensuing award is a criminal offense (U.S. Code, Title 18, Section 1001).</span> <a id="elig_prop_num_txt" name="elig_prop_num_txt"></a>
Is this a realistic fit?
- Past Mathematical and Physical Sciences awards averaged $568,976; this notice allows up to $300,000 per award.
- Most of the program's money (80% over five years) went to colleges and universities.
- No cost sharing or match is required.
What the grant funds
The purpose of the Mathematical and Physical Sciences Ascending Postdoctoral Research Fellowship (MPS-Ascend) program is to support postdoctoral Fellows who will broaden the participation of members of groups that are historically excluded and currently underrepresented in MPS fields in the U.S., defined in this solicitation as Blacks or African Americans, Hispanics, Latinos, Indigenous and Native Americans, Alaska Natives, Native Hawaiians and other Native Pacific Islanders,as future leaders in MPS fields. The program is intended to recognize beginning investigators of significant potential and provide them with experience in research that will broaden perspectives, facilitate interdisciplinary interactions, and help broaden participation within MPS fields. The program funds postdoctoral Fellows in research environments that will have maximal impact on their future scientific development and facilitates their transition into a faculty appointment. Awards will support research in any scientific area within the purview of the five MPS Divisions: the Divisions of Astronomical Sciences (AST), Chemistry (CHE), Materials Research (DMR), Mathematical Sciences (DMS), and Physics (PHY). Fellowships are awards to individuals, not institutions, and are administered by the Fellows.
Who has won Mathematical and Physical Sciences grants before
From fiscal 2021 to 2025, Mathematical and Physical Sciences (47.049) awarded $8.5 billion across 14,898 grant awards, an average of $568,976 per award.
| Recipient | State | Awards | Amount |
|---|---|---|---|
| Association of Universities for Research in Astronomy, Inc. | Arizona | 22 | $725 million |
| Associated Universities Inc | Virginia | 18 | $646 million |
| California Institute of Technology | California | 148 | $316 million |
| Cornell University | New York | 179 | $256 million |
| Florida State University | Florida | 92 | $228 million |
Applying now
This notice no longer takes applications. Apply under the newer notice, NSF 27-500, which is open now.
The notice on Grants.gov keeps its full text and attachments, which is useful for planning a resubmission.
Questions people ask
Is NSF 23-501 still open?
No. It is no longer open on Grants.gov. A newer notice is open: NSF 27-500, closes January 29, 2027 (83 days left).
Who can apply for Mathematical and Physical Sciences Ascending Postdoctoral Research Fellowships?
U.S. National Science Foundation accepted applications from the applicants described in the notice. The notice adds further conditions, so read its eligibility section.
What is the deadline for Mathematical and Physical Sciences Ascending Postdoctoral Research Fellowships?
Closed. Applications are no longer accepted; the program's newer notices are on this page when there are any.
How much funding is available?
Awards of up to $300,000 each. About $10.0 million in total across about 50 awards.
Who has won Mathematical and Physical Sciences grants before?
The largest recipients over five fiscal years were Association of Universities for Research in Astronomy, Inc., Associated Universities Inc, California Institute of Technology. The program made 14,898 awards worth $8.5 billion in that time.